Spin-polarized tunneling in nanostructured La2=3Sr1=3MnO3

A. CANEIRO; D. NIEBIESKIKWIAT; D.M. SANCHEZ; D. GARCÍA; B. ALASCIO

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2002 vol. 320 p. 104 - 106

0921-4526

We present magnetic and transport properties of nanocrystalline La2=3Sr1=3MnO3 powders prepared by a gelcombustionmethod using citric acid as the fuel. The coercive magnetic field Hc is significantly different to the field Hncfor which the magnetoresistance (MR) is maximum. The MR at low fields (LFMR) exhibits a power-law dependencewith magnetization, MRpMn; with n ¼ 2:5–3.3 for temperatures ranging from 5 to 200 K: The results are discussed interms of a distribution of particle size in our sample.